Obi's Long and Dangly

I believe my answer can be given right off as the sizes sold often are longer to fit properly when bought from karate belt stores. I was one of those who felt that the longer ends were more a nuisance than anything. I would purchase a size 5 obi, put it on so one end was the length I wanted it and then I would perform surgery on the other end to make them meet properly. I usually wanted about six inches hanging down with no more than eight inches maximum (a good way to judge this is enough end to put your hands on each and pull the knot tight). Then when sparring, etc. I would do, as you may be able to see in one of these photo's, tuck the ends in the obi at the waist to remove those dangling ends. Why, you might say?

Well, when I first put on a green belt and when I first started to learn how to fight/spar, Henry sensei would reach in and grab the end and then pull me around the dojo like a whip. I quickly learned to shorten the obi and then tuck it in making it a more difficult target. Not that I would have to worry about the obi in a fight or self-defense (I was a Marine then and fighting was an option vs. just self-defense but hey I was a Marine). 

I often wonder if in most of today's dojo what the reason might be for the longer ends on the obi. I believe the sizes, say from size 4 to size 5, that the ends would be within the standards I use and if not then either shortening one end or actually making a custom purchase would work. I am not saying the kyu grades would go custom but as to the black belt that is often worn an entire life of a martial artists is often a one time purchase. 

I have seen ends dangling down past the knees and wonder, why do they do that? I can tell from that length that the next size down would bring the ends closer to the length that seems to me more appropriate but I wonder why? Is it ego? Is it some symbolic thing? Is it because the dangling and swinging of the ends in kata contribute to the sense that one is doing kata with spirit, vigor and effectiveness? If so, NOT. 

I wonder why the ends of the obi tend to be long, swing, sway and dangle like they do. ;-) Take a look at the photos attached. The first one is of a first generation pair of practitioners practicing Isshinryu in 1965 and the second is another first gen practitioner on the left and a more modern practitioner on the right (note that you can see the end dangle just to the right of his forward thigh and appears longer than the guy on the left of the snapshot. 

Can anyone answer me why as to such long ends on the obi? 

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